| Alnmouth Arts Festival CIC | Alnwick | 2024 |
| Alnmouth Golf Club.Limited(The) | Northumberland | 1930 |
| Alnmouth Village Golf Club Limited | Alnwick | 2015 |
| Alnwick Allstars Limited | Alnwick | 2023 |
| Alnwick and District Motor Club Limited | Alnwick | 1978 |
| Alnwick Castle Golf Community Interest Company | Alnwick | 2024 |
| Alnwick Cricket Club (1837) Limited | Alnwick | 2015 |
| Alnwick Golf Breaks Limited | Sunderland | 2021 |
| Alnwick International Music Festival | Morpeth | 2000 |
| Alnwick Playhouse Trading Limited | Alnwick | 2024 |
| Alnwick Sporting Club Limited | Morpeth | 2007 |
| Alnwick Story Fest Community Interest Company | Alnwick | 2022 |
| Alnwick Youth Hostel Ltd. | Alnwick | 2006 |
| ALO Loco Ltd | Burnham-On-Crouch | 2025 |
| Aloa Events Limited | Hampton | 2023 |
| Aloa Lighting Ltd | Hampton | 2023 |
| Alof Ltd | South Shields | 2023 |
| Alogo Equestrian Limited | Blackburn | 2023 |
| Aloha Moorgate Ltd | Kingston Upon Thames | 2022 |
| Aloha Richmond Ltd | Kingston Upon Thames | 2022 |
| Alonglines Limited | Brighton | 2005 |
| Alongside Projects Ltd | Wigan | 2025 |
| Alora Lagree Ltd | London | 2026 |
| Alora Studios Group Ltd | Leeds | 2025 |
| Alordia Promotions UK Ltd | London | 2025 |
| Aloriamo Limited | Watford | 2026 |
| Aloud Together CIC | Hornsea | 2024 |
| Aloura Entertainment Ltd | Liverpool | 2025 |
| Aloys Junior Enterprise Ltd | Spalding | 2024 |
| Aloysius Grace Limited | Wembley | 2021 |
| ALP Productions Limited | Barnsley | 2006 |
| ALP Racing Limited | Ipswich | 2018 |
| Alpaca Days OUT Limited | Burntwood | 2021 |
| Alpaca My Boots Ltd | Brecon | 2019 |
| Alpaca Punch Ltd | Pontefract | 2024 |
| Alpacas at Carsington Limited | Buxton | 2026 |
| Alpahenen Ltd | London | 2021 |
| Alpamike Limited | | 1992 |
| Alpana Sengupta Dance Company | Wisbech | 2023 |
| Alparq UK Limited | Leicester | 2017 |
| Alpha & Omega Gates Limited | Staines-Upon-Thames | 2025 |
| Alpha & Omega Performance Ltd | Wolverhampton | 2023 |
| Alpha 55 Events Limited | Wrexham | 2014 |
| Alpha Academy Oxford Ltd | Oxford | 2021 |
| Alpha Amateur Boxing Club Limited | Swindon | 2024 |
| Alpha Art Limited | Edinburgh | 2009 |
| Alpha Art Trades Ltd | Northampton | 2024 |
| Alpha Athletic Ltd | Newport | 2018 |
| Alpha Boxing and Fitness Limited | Swindon | 2024 |
| Alpha Broadcast Facilities Limited | Stroud | 2018 |
| Alpha Fit Ltd | Rotherham | 2025 |
| Alpha Fit Training Ltd | Stalybridge | 2026 |
| Alpha Fitness Hampshire Limited | Winchester | 2020 |
| Alpha Fitness Pro Ltd | Mayfair | 2023 |
| Alpha Flying Limited | Wokingham | 1981 |
| Alpha Gospel Academy Ltd | Wembley | 2026 |
| Alpha Group Partnership Ltd | Cardiff | 2023 |
| Alpha Gym (N.I.) Ltd | Banbridge | 2022 |
| Alpha Hockey Academy Ltd | Tidworth | 2025 |
| Alpha HPF Ltd | Newcastle | 2019 |
| Alpha Industry Limited | London | 2018 |
| Alpha Leisure Amusements Ltd | Manchester | 2012 |
| Alpha Leisure Services Ltd | London | 2018 |
| Alpha Margo 444 Ltd | London | 2025 |
| Alpha Muscle Gym Limited | Bedford | 2024 |
| Alpha Numero Limited | London | 2017 |
| Alpha Performance (N.I.) Ltd | Downpatrick | 2018 |
| Alpha Pro Creative CIC | Kings Bromley | 2025 |
| Alpha Rigging Ltd | Grays | 2017 |
| Alpha Sport Limited | Bishop'S Stortford | 2019 |
| Alpha Sport Racing Ltd | York | 2023 |
| Alpha Sports Management Limited | Northampton | 2019 |
| Alpha State Fitness Ltd | Woodford Green | 2019 |
| Alpha Taekwondo Ltd | Uxbridge | 2021 |
| Alpha Theatrical Ltd | London | 2017 |
| Alpha Victor Ltd | Bungay | 2015 |
| Alpha Zuriel Publishing Ltd | London | 2024 |
| Alphabet Arts Ltd | Lancashire | 2005 |
| Alphabet Corporation Limited | Malvern | 2007 |
| Alphabet Gym Ltd | Bristol | 2017 |
| Alphabet Pictures Limited | Chalfont St Peter | 2005 |
| Alphabetti Trading Limited | Newcastle Upon Tyne | 2018 |
| ALPHADESIGN1 Ltd | Coventry | 2024 |
| Alphagal Ltd | Brighton | 2024 |
| Alphagardenservices Ltd | Willenhall | 2025 |
| Alphaland Ltd. | Wokingham | 1998 |
| Alphamum Productions Ltd | London | 2019 |
| Alpine Adventure Leisure Limited | Manchester | 2024 |
| Alpine Club Library | London | 1971 |
| Alpine Club Photo Library Ltd | London | 2002 |
| Alpine Coaching Limited | Hemel Hempstead | 2011 |
| Alpine Guides Ltd | Sheffield | 2003 |
| Alpine Mountain Adventures Ltd | Carrbridge | 2010 |
| Alpine Pros Limited | Wickford | 2018 |
| Alpine Racing Limited | Chipping Norton | 1984 |
| Alpine Rando Limited | Penrith | 2006 |
| Alpine Stunts Limited | Redruth | 2023 |
| Alpine Waters Capital Limited | London | 2021 |
| Alpixel Ltd | Walsall | 2024 |
| Alresford Angling Association | Clacton-On-Sea | 2023 |